21610265255 has 8 divisors (see below), whose sum is σ = 25937764272. Its totient is φ = 17284581568.

The previous prime is 21610265231. The next prime is 21610265317. The reversal of 21610265255 is 55256201612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21610265255 - 2⁸ = 21610264999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427502 + ... + 475371.

It is an arithmetic number, because the mean of its divisors is an integer number (3242220534).

Almost surely, 2^21610265255 is an apocalyptic number.

21610265255 is a deficient number, since it is larger than the sum of its proper divisors (4327499017).

21610265255 is an equidigital number, since it uses as much as digits as its factorization.

21610265255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907665.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 21610265255 its reverse (55256201612), we get a palindrome (76866466867).

The spelling of 21610265255 in words is "twenty-one billion, six hundred ten million, two hundred sixty-five thousand, two hundred fifty-five".